There's always some sort of secret mythology around Halloween when it comes to hauntings, but this is no friendly Halloweentown. When the ghosts walk among the living at the mansion, Violet learns that her "friend" Tate is actually the ghost of a violent school shooter who went on a murder spree after his mother Constance killed his little brother. Addie is killed in a hit-and-run, and Constance doesn't get her body back to the mansion in time for her to return as a ghost.
Horrified by the revelations about Tate — and that she still has feelings for him — Violet attempts suicide. At first, she thinks Tate saved her, but weeks later, she cannot leave the house and discovers that her attempt was successful and she is a ghost. She eventually breaks up with Tate after learning that not only did he rape her mother and kill his classmates, but also murdered the couple that previously lived in the house. All the ghosts become too much for Vivien, and she appears mad to the rest of the world and is committed to an asylum.